My computer fcd reads accurately.Are you using the computer, or do you do the long math at the pump after filling?
I reset my odometer at every fill up then calculate how many miles into the gallons. I see the computer read out, but don’t use it.
Air filter, K&N or OEM, exhaust, stock or bolt on?
Air filter is standard. Pipes are stock. Some people report massive mileage gains with aftermarket pipes sans cats. Do you have experience with aftermarket pipes?